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3. Physical period: Uniform circular motion is a kind of periodic motion. The so-called periodicity refers to the fact that after a certain period of time, the moving object repeats back to its original position, and the instantaneous speed repeats back to its original size and direction. The time it takes for an object to move in a uniform circle is called a period. The period is expressed by the symbol T, and the period is also a physical quantity describing the speed of uniform circular motion. The long period indicates the slow motion of the object, while the short period indicates the fast motion of the object.Crossing Stagnation//201In addition, the premise of safeguarding rights is to pay attention to personal safety and never take drastic actions. For example, don't do anything to protest with death. If you stay in the green hills, you are not afraid of burning firewood. Besides, if the protest is really successful, you can't enjoy the joy of getting back the funds. What you get is only the tears of your relatives. Why bother?　　长安城被连绵的阴雨笼罩，人们说这预示着上天将赐予大唐一个美丽绝伦的公主。在皇宫深处，皇后武则天却被比天气还阴晦的心情笼罩，她已经怀胎十二个月而无法临盆，这使她深信多年前因权力斗争而被自己扼杀在襁褓中的女儿又回来了，她无数次在佛像前祈求女儿的谅解和宽耍当唐军将士大胜突厥的喜讯传来，公主终于降生在朝堂之上。这奇异的经历使高57550f6f8bdc4603b53f676f4b7ffc2一时吃完，少年们打着饱嗝，慢腾腾地起身，准备去书房用功。